Adds portuguese language & @ symbols

[auyer]

This PR adds the Portuguese language

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f701be4) to head (d353393).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #79   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files            2         2           
  Lines          119       121    +2     
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+ Hits           119       121    +2     

Files	Coverage Δ
languages_substitution.go	100.00% <ø> (ø)
slug.go	100.00% <100.00%> (ø)

[IamNator]

Reviewed PR and confirmed that the following substitutions for Portuguese are correct: '&' -> 'e', '@' -> 'em'. Also verified the following language abbreviations: 'pt', 'prt', 'pt-br', 'por'. No further issues found.

[IamNator]

Reviewed PR and confirmed that the following substitutions for Portuguese are correct: '&' -> 'e', '@' -> 'em'. Also verified the following language abbreviations: 'pt', 'prt', 'pt-br', 'por'. No further issues found.

"pt" is the ISO 639-1 language code for Portuguese.
"prt" is another abbreviation used for Portuguese, which is derived from the three-letter ISO 639-2 code for the language.
"pt-br" is the language code used for Brazilian Portuguese, which is a variation of the Portuguese language spoken in Brazil.
"bra" is not a commonly used abbreviation for Portuguese. However, it could be an abbreviation for Brazil, which is a country where Portuguese is the official language.
"por" is a three-letter ISO 639-2 code for Portuguese, which is used to represent the language in various contexts.

[IamNator]

Reviewed PR and confirmed that the following substitutions for Portuguese are correct: '&' -> 'e', '@' -> 'em'. Also verified the following language abbreviations: 'pt', 'prt', 'pt-br', 'por'. No further issues found.

'&' is commonly substituted by "e" in Portuguese, which means "and" in English.

'@' is usually substituted by "em" in Portuguese, which means "in" or "on" in English.

[matrixik]

Thank you for this and sorry it took so long.